Guix

Dedukti is a proof-checker for the λΠ-calculus modulo theory. The λΠ-calculus is an extension of the simply typed λ-calculus with dependent types. The λΠ-calculus modulo theory is itself an extension of the λΠ-calculus where the context contains variable declaration as well as rewrite rules. This system is not designed to develop proofs, but to check proofs developed in other systems. In particular, it enjoys a minimalistic syntax.